Made with superstrong, high-tensile 100% fluorocarbon, the RIO Fluoroflex Strong Tippet is perfect for your big-fish adventures. The supple design makes it easy to tie knots, while the smooth finish means those knots seat tightly so you won't suffer the heartbreak of a fish pulling your knot through. The high break-strength-to-diameter ratio means you get the best of both stealth and durability. 100% fluorocarbon tippet Supple and smooth for easy, secure knots High break-strength-to-diameter ratio for both stealth and strength